Augustus hamann



UNITED sTaTns PATENT omnes.

AUGUSTUS HAMANN, VASHINGTON, DISTRICTOF COLUMBIA.

CHIMNEY-CAP.

Specification of Letters Patent No. 4,117, dated July 22, 1845.

To all whom t may concern:

Be it known that I, AUGUSTUS THA-MANN, of the city of l/Vashington, inthe District of Columbia, have invented a new and useful Apparatus forCuring Smoky Chimneys; and I do hereby declare that the following is afull, clear, and exact description of the construction and operation ofthe same, ref* erence being had to the annexed drawings, making a partof this specification, in which- Figure 1 is an isometrical projectionof the complete apparatus, and Fig. 2 another one of the same withoutthe casing.

The apparatus to cure smoky chimneys consists of a square box a, lwhichnear its lower extremity has a flange ZJ by which it sets on the top ofthe chimney flue, that part of the box which is below said flangeentering the flue itself. Immediately above the flange there are narrowoblong openings c, one on each side of this box. Inside of this box,there are, diagonally, four plates CZ, which lengthwise and in thecenter of the box are soldered or otherwise connected together. Theopposite edge of each of said plates is soldered or otherwise fastenedin the angles of the box aforen-amed. These plates extend somewhat abovethe top-edge of the box, and toward the center rise at angle of about 45degrees, more or less. The angular top edges of the plates (l arecovered by other plates e, which however do not quite reach up to thecenter, but leave tri angular openings f for the purpose hereafterdescribed. The plates Z rising above the box leave also on each side anoblong opening g between the lower edge of the plates e and the top ofthe box` similar to the openings c. Both series of openings (f and g)are for the purpose of letting the smoke escape. Between each two platesd,

the plates cl in such a manner as to form an angle of 45 degrees, moreor less., with the' horizon. They do not quite come up to the angleformed by the plates d, but sufficiently far as to leave a small openingi, through which the smoke from the fireplace passes, and assisted bythe draft entering at c, escapes through the aforesaid openings f and g.

The above described apparatus may be made oftin, sheet-iron, or othersuitable material.

To prevent newlybuilt chimneys from smoking, the same apparatus may beused, doing away with the box a, and leaving openings, say one course ofbricks in the chimney itself, to correspond to the openings c on thedrawing. In fact all the rest, except the `box as above said, must beset or built into the flue in the same manner as it is fixed in the box,the plates (Z rising somewhat above the top of said flue.

Operation: Of the operation of the apparatus but little need be said.The draft of the air entering" through the openings c assists the smokecoming up the chimney, and passing through the triangular openings z',to escape through the top openings. During strong winds, of course, thesmoke will only, and must escape on three, and at the very worst, on twosides, as but two sides can be operated upon by the wind at the sametime. It may be remarked here that the area of the openings c must besmaller than that of the openings z'.

That T claim as my invention and desire to secure by Letters Patent, is:

The manner of combining the plates 6l, e and L with each other, and withthe box a, the whole being constructed, arranged, and operated as abovedescribed, and substantially for the purpose set forth.

AUGUSTUS HAMANN.

Witnesses:

FRANCIS BENNE,

T. C. DONN.

